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Gerald slipping on x axis #911

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jackie1050 opened this issue Sep 14, 2018 · 11 comments

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commented Sep 14, 2018

@MatthewCroughan says that @magman2112 has a right angled screwdriver that can be used for tightening the belt - perhaps we should buy something similar for the laser maintenance team.

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@dazz-ling

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commented Sep 16, 2018

I was doing quite a bit on it last night and it all worked fine, even at quite high speeds.
The only things I did notice was a software issue, in that it crashed or froze a couple of times and the bed alignments seemed out again

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commented Sep 16, 2018

I was expecting that we would need to tighten this belt in the near future, as it is only a week since it was replaced and some relaxing of the new belt is normal as it stretches slightly in use. A lesson learned perhaps is that we should do this after a few days, rather than the week I anticipated.

It does not need any special tools for adjustment, just a Phillips screwdriver that is not too long, especially if you open the access door on the left side of Gerald. You do have to careful to adjust the tension evenly though, to keep the belt even on the idler wheel, so as to prevent uneven wear on the edges of the drive belt.

Unfortunately, I have not been able to get into DoES for a few days with family issues, but I do plan to come in in either Monday, or Tuesday at the latest, and can check on this if no one else has a chance before I get in.

@Sean-anotherone

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commented Sep 16, 2018

If slippage is an ongoing issue some new pulleys might help. I use these guys for standard timing pulleys and endless belt : http://www.beltingonline.com/timing-pulleys-bars-272/

If there are any issues with periodic error (presenting as a "slack side" on the pulleys) I can dress pulleys between centers to ensure they're perfectly concentric.

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commented Sep 18, 2018

I adjusted the belt tension 9n Monday, it had stretched quite a bit. I also showed @MatthewCroughan how I adjusted it, so there are other folks more likely to be in DoES who can make this adjustment if needed.

I will leave this issue open for a few days, so we can get feedback on the use of Gerald in case this has not resolved this issue. I will also check the tension again in a few days, as I expect the belt to stretch a bit more.

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commented Sep 19, 2018

@Sean-anotherone

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commented Sep 19, 2018

@jackie1050

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commented Sep 19, 2018

@magman2112

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commented Sep 19, 2018

OK, I might be mistaken in the “Stretching” of the belt, but from my experience, after replacing the belt on Gerald, it does need to be re-tightened a few times to keep the correct tension in the belt - then it tends to settle down.

Thinking about it, this may be a bit of slippage in the mounting points on the head, but I had assumed it was due to a slight give in the belt. We are talking of over 3m of belt that is installed for this axis, so a small amount of give can make a difference over this length.

To answer @jackie1050 question, I would give it a week or two of successful cuts before attempting a critical cut, like the for the Knitic. I will check the tension again tomorrow and likely every few days, to see if there are any significant adjustments are needed and also when the changes tend to settle down.

This is all part of the learning process for me, on how Gerald works along with its little foibles.

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commented Sep 20, 2018

@amcewen amcewen removed the Broken label Sep 28, 2018

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commented Sep 28, 2018

Given that Gerald seems to have been running fine since @magman2112's adjustments, I've taken the broken label off this so it's not marked as out-of-service on status.doesliverpool.com. (For future reference, @magman2112, and the rest of the laser-maintenance team, feel free to tweak the labels on an issue where appropriate)

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commented Apr 2, 2019

Closing this issue now, as new belts and clamps have been fitted that appear to have addressed this issue.

@magman2112 magman2112 closed this Apr 2, 2019

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